Combine wet ingredients and oats: In a large measuring jug, combine oats with wet ingredients. Stir well, then set aside and let stand for 5 minutes (if using quick cooking oats) to 10 minutes (for old fashioned oats).

Prep: While the oats are soaking, preheat the oven to 400°F and line a 12 cup muffin pan with liners.

Mix dry ingredients: Add dry ingredients to a large bowl. Mix very well.

Combine wet and dry ingredients: Add the wet ingredients to the bowl with the dry ingredients and fold just until combined. DO NOT OVERMIX!!

Add the berries: Toss the berries in 1 tablespoon flour. Add the flour-coated berries to the batter and fold in by stirring 2-3 times. No more!

Finish and bake: Evenly divide the batter between 12 muffin cups (this is SO easy with a cookie scoop! - FYI this is an affiliate link and I earn a commission if you click through and make a purchase). Bake at 400 degrees for 18-20 minutes, or until a toothpick inserted comes out clean. Cool in the pan for 5 minutes, then cool completely on a cooling rack.